Results 161 to 170 of about 893 (201)
A global synthesis of the latest Ordovician Hirnantian brachiopod faunas
Transactions of the Royal Society of Edinburgh: Earth Sciences, 1988 ABSTRACTA global review of new and existing data on the distribution of uppermost Ordovician (Hirnantian) brachiopods indicates the existence of at least three biogeographically distinct faunas. The typical Hirnantia fauna characterised subtropical and temperate latitudes and comprised a variety of ecological associations; the fauna reached its acme ...
Rong Jia-yu, David A. T. Harper
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Hirnantian (Late Ordovician) brachiopod faunas across Baltoscandia: A global and regional context
Palaeogeography, Palaeoclimatology, Palaeoecology, 2016 A diverse, typical Hirnantia brachiopod fauna from terminal Ordovician strata in Latvia extends the distribution of the Kosov Province across much of the Baltic Palaeoplate into the deeper-water facies of the East Baltic.
David A T Harper, Linda Hints
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Taphonomy of exceptional sponge preservation in the Hirnantian Anji Biota, China
Journal of the Geological Society, 2022The Anji Biota is a unique deposit with exceptionally preserved sponges and other organisms in deep-water, uppermost Ordovician mudstone of Zhejiang Province, China. The sponge fossils preserve remarkable details including carbonaceous preservation of soft tissues and axial filaments of spicules, but the taphonomy of the deposit has not previously been
Xuejin Wu +4 more
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Earth-Science Reviews, 2010 This paper proposes a global review of Hirnantian event stratigraphy. The Hirnantian GSSP in south China is tentatively correlated with latest Ordovician strata from the peri-Gondwanan "glacial" regions.
VECOLI, MARCO +3 more
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Steep oceanic DIC δ13C depth gradient during the Hirnantian Glaciation [PDF]
Earth-Science ReviewsThe Hirnantian carbon isotopic excursion (HICE) was characterized by a positive δ13C excursion (up to ∼ + 7‰) of oceanic dissolved inorganic carbon (DIC).
Shengchao Yang +12 more
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Decreased marine organic carbon burial during the Hirnantian glaciation
Earth and Planetary Science LettersShengchao Yang, Junxuan Fan
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Earth and Planetary Science LettersThe Hirnantian isotopic carbon excursion (HICE) records a dramatic perturbation to the global carbon cycle across the Late Ordovician Hirnantian glaciation.
Zhen Qiu, Wenjiao Xiao, Paul B Wignall
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Environmental changes in the Hirnantian (upper Ordovician) of the Prague Basin, Czechoslovakia
Geological Journal, 1989AbstractSedimentary sequences through the uppermost Ordovician (Hirnantian), Kosov Formation, are described. The Kosov Formation is a shale‐dominated formation with two thin horizons of sandy diamictites near the base and two ‘flysch’ units separated by shales forming the main part of the formation, which is overlain abruptly by Silurian graptolitic ...
P. J. Brenchley, P. Štorch
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Pre‐Hirnantian Ashgill climatically warm event in the Mediterranean region
Lethaia, 2003Compilation of the marine, benthic megafossils from approximately the mid-Ashgill of the Mediterranean region, including much of Central and Southern Europe plus North Africa, and elsewhere indicates a warm interval featuring bioclastic limestone and a warm climate marine fauna.
A.J Boucot +3 more
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Circular, Cryogenic Structures from the Hirnantian Deglaciation Sequence (Anti-Atlas, Morocco)
Journal of Sedimentary Research, 2013Abstract More than a hundred circular structures are observed at the topmost part of the Late Ordovician glaciogenic record in the central Anti-Atlas, southern Morocco. The structures were formed in the outer glaciated platform and characterize the Hirnantian deglaciation sequence.
Nutz, Alexis +2 more
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